DK50698C
(en )
1935-09-30
Electrodynamic sound reproducing apparatus.
DK70011C
(en )
1949-10-03
Sound carrier for magnetic recording.
DK61860C
(en )
1944-01-31
Apparatus for sound recording and reproduction by means of sound carriers mounted on coil sets.
DK70010C
(en )
1949-10-03
Apparatus for removing amplitude variations by magnetic sound recording.
DK55822C
(en )
1939-02-13
Procedure and Apparatus for Recording Sound.
DK66382C
(en )
1948-03-01
Method and Apparatus for Erasing Magnetic Sound Records.
DK56231C
(en )
1939-05-30
Procedure for Reproducing a Sound Record on Film and Apparatus for Exercising the Procedure.
DK67911C
(en )
1948-11-08
Method and apparatus for stereophonic sound recording or sound transmission and sound reproduction.
DK57289C
(en )
1940-02-19
Audio films with control tracks and apparatus for sound reproduction by means of such films.
DK61272C
(en )
1943-08-30
Apparatus for Recording Tone Fluctuations.
DK55480C
(en )
1938-11-21
Apparatus for recording Gramophone records.
DK52126C
(en )
1936-09-07
Procedure and Apparatus for Sound Reproduction Using Multiple Sounders.
DK51820C
(en )
1936-06-29
Apparatus for reproducing sound.
DK42626C
(en )
1930-07-21
Apparatus for recording and reproducing sound.
DK60739C
(en )
1943-03-29
Sound reproducing apparatus.
DK76764C
(en )
1953-11-30
Apparatus for recording or reproducing images.
DK73365C
(en )
1951-11-12
Apparatus for recording or reproducing images.
DK52223C
(en )
1936-09-28
Electromagnetic recording apparatus, in particular for recording sound tracks.
DK51614C
(en )
1936-05-11
Sound reproducing apparatus.
DK57818C
(en )
1940-07-22
Method and Apparatus for Volume Expansion during Audio Film Reproduction.
DK58354C
(en )
1941-01-20
Apparatus for recording or reproducing films, in particular image sound films.
DK62510C
(en )
1944-07-31
Apparatus for receiving and recording telegraph signals.
DK77048C
(en )
1954-02-01
Apparatus for reproducing sound recorded on gramophone records.
DK32005C
(en )
1923-07-23
Apparatus for reproducing or recording sound.
DK65484C
(en )
1947-08-04
Apparatus for Reproducing Images.